61556005 has 24 divisors (see below), whose sum is σ = 87940512. Its totient is φ = 41221152.

The previous prime is 61555973. The next prime is 61556021. The reversal of 61556005 is 50065516.

61556005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61556005 - 2⁵ = 61555973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7614 + ... + 13456.

It is an arithmetic number, because the mean of its divisors is an integer number (3664188).

Almost surely, 2^61556005 is an apocalyptic number.

It is an amenable number.

61556005 is a deficient number, since it is larger than the sum of its proper divisors (26384507).

61556005 is a wasteful number, since it uses less digits than its factorization.

61556005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5905 (or 5898 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 61556005 is about 7845.7635065046. The cubic root of 61556005 is about 394.8421203154.

The spelling of 61556005 in words is "sixty-one million, five hundred fifty-six thousand, five".